package com.Monica.Servlet;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

public class UploadServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.先判断上传的数据是否多段数据(只有多段的数据，才是文件上传的)
        if (ServletFileUpload.isMultipartContent(req)){
            //创建FileItemFactory工厂实现类
            FileItemFactory fileItemFactory = new DiskFileItemFactory();
            //创建用于解析上传数据的工具类ServletFileUpload类
            ServletFileUpload servletFileUpload = new ServletFileUpload(fileItemFactory);
            try {
                //解析上传的数据，得到每一个表单项FileItem
                List<FileItem> list = servletFileUpload.parseRequest(req);
                for (FileItem fileItem : list){
                    if (fileItem.isFormField()){
                        //普通表单项

                        System.out.println("表单项的name属性值:" + fileItem.getFieldName());
                        //参数UTF-8,解决乱码问题
                        System.out.println("表单项的value属性值:" + fileItem.getString("UTF-8"));
                    }else {
                        //上传文件
                        System.out.println("表单项的name属性值:" + fileItem.getFieldName());
                        System.out.println("上传的文件名:" + fileItem.getName());

                        fileItem.write(new File("e:\\" + fileItem.getName()));
                    }
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
